CN101321009B - Self-adapting MIMO system and its signal processing method - Google Patents
Self-adapting MIMO system and its signal processing method Download PDFInfo
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Abstract
The invention discloses a self-adapting MIMO system and a signal processing method thereof, comprising a transmitting terminal including an antenna, a receiving terminal including a signal detecting module and a unite channel decomposition module and a feedback path from the receiving terminal to the transmitting terminal, wherein the unite channel decomposition module decomposes the channel matrix, decomposes out a precoding matrix feed back to the transmitting terminal through a feedback path, decomposes out a weight coefficient matrix transmitted to the signal detecting module. The invention also discloses a self-adapting MIMO system, which compounds the two systems. The MIMO system and the signal processing method can adapt the performance of high related channel, meanwhile adapt different transmitting and receiving antenna number, and advances the capacity and the performance of the system.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, relate to a kind of adaptive MIMO (Multiple-Input Multiple-Out-put, multiple-input and multiple-output) antenna system and signal processing method thereof.
Background technology
MIMO technology in the mobile communication refers to utilizes many transmit antennas and Duo Gen reception antenna to carry out the technology of wireless transmission; Any one wireless communication system; As long as its transmitting terminal and receiving terminal have all adopted a plurality of antennas or aerial array, just constituted a radio MIMO system.In mimo system, signal transmits and receives through a plurality of antennas of transmitting terminal and receiving terminal, thereby improves each quality of services for users (bit error rate or data rate).. treatment technology carried out signal processing when radio MIMO system adopted sky.Under multi-path environment, radio MIMO system can greatly improve the availability of frequency spectrum, increases the data transmission rate of system.According to the transmitting-receiving two-end antenna amount; With respect to common SISO (Single-Input Single-Output; The single output of single input) antenna system; Utilize mimo channel can improve the wireless channel capacity exponentially, under the situation that does not increase bandwidth and antenna transmission power, the availability of frequency spectrum can improve exponentially.Also can improve simultaneously the reliability of channel, reduce the error rate.
In general multi-antenna technology, comparatively be typically the base station and be equipped with many antennas, because it is generally acknowledged that the base station more can outer cost and the space of commitment than portable terminal.
In the past few years, it is more and more important that wireless traffic becomes, and simultaneously higher network capacity and more high performance demand constantly increased.Several kinds of selection modes are limited like the potentiality that in fact modulation system even the code reuse system of more high bandwidth, optimization improve spectrum efficiency.Mimo system utilizes space multiplexing technique to improve the efficient of institute's utilized bandwidth through adopting aerial array.
Be called spatial reuse through more than one antenna transmission multi-group data stream, wherein have two types:
First type is VBLAST (Vertical Bell laboratory layering space-time), and it sends the uncoded data flow in space, need not consider on receiver, signal to be carried out equilibrium treatment.
Second type through space-time coding (being Space Time Coding) realization.Compare with VBLAST, Space Time Coding provides the orthogonal coding mode, is independent data stream therefore.The VBLAST method can not separate data streams, the interference of a plurality of data flow therefore can occur, and this can make transmission become unstable, and the forward error coding always can not address this problem.The detection of Space Time Coding signal is based on a kind of simple linear process, and the acquisition rational result.The advantage of spatial reuse is the quantity linear correlation of the increase of capacity and transmitting antenna.
To the traditional research focus of MIMO communication is to have only receiving terminal known channel information (CSIR) always; If yet wireless propagation environment is slow fading channel (channel parameter changes slower in time); For example indoor environment and Local wireless network; We can arrive transmitting terminal with feedback of channel information through up link, and the channel information of transmitting terminal utilization feedback carries out preliminary treatment to the data that will send and just can improve systematic function.Based on this hypothesis, feedback--the focus of pre-coding scheme design becoming gradually research.Existing feedback--pre-coding scheme is based on SVD's (singular value decomposition).For simplicity, be example with 22 mimo systems of receiving, the system of this scheme is as shown in Figure 1.
With reference to shown in Figure 1, this SVD system comprises transmitting terminal and receiving terminal, and comprises feedback path 113.Transmitting terminal comprises: information source module 101, modulation module 102, precoding module 103, string and modular converter 104, VBLAST transmitter module 105, and 2 transmitting antennas 106; Receiving terminal comprises: 2 reception antennas 107, pretreatment module 108, channel estimation module 109, signal detection module 110, SVD decomposing module 111, demodulation module 112.
Transmitting terminal at first utilizes modulation module 102 to modulate to 01 sequence of information source 101; Modulation utilizes from receiving terminal later carries out precoding through the pre-coding matrix V of feedback path 113 feedbacks to modulation signal; Precoding is accomplished in precoding module 103, go here and there through string and modular converter 104 at last and change the back in the VBLAST module with the form of VBLAST from transmitting antenna 106 emissions.Here VBLAST emission is exactly that every antenna of transmitting terminal sends one of them of parallel data simultaneously.
Receiving terminal estimates through 109 pairs of channels of channel estimation module that at first to obtain current channel parameter, input SVD decomposing module 111 is carried out SVD to channel matrix and decomposed.SVD decomposes 3 matrix: U of generation, S, V (H=U * S * V
*), V feeds back to the precoding module 103 of transmitting terminal as pre-coding matrix, and U sends to pretreatment module 108 as the preconditioning matrix of receiving terminal, and S sends to signal detection module 110 as the virtual channel matrix in the input.Wherein S is that diagonal element is channel matrix singular value λ
1, λ
2..., λ
KDiagonal matrix, so SVD decomposition meeting is resolved into a plurality of parallel virtual subnet channels with mimo channel, with reference to shown in Figure 2, be the pseudo channel model of SVD scheme.χ wherein
1, χ
2..., χ
KBe transmitting of each virtual subnet channel, y
1, y
2..., y
KBe the reception signal of each virtual subnet channel,
Be additive white Gaussian noise.We can use detection algorithms such as " zero forcing algorithms " in the signal detection module 110 of receiving terminal.In demodulation module 112, signal is carried out demodulation after having detected and obtain 01 information sequence.
The SVD scheme realizes simple, but following shortcoming is arranged:
The channel that 1, can not adapt to different correlations
Actual mimo channel is very complicated, and the parameter of channel receives the influence of several factors.If the envelope of signal very " similar " when between two antennas of receiving terminal, receiving same signal, we just claim that this coefficient correlation to antenna is bigger.The signal that coefficient correlation is bigger is actually signal and does not just arrive receiving terminal through enough scattering processes; And the gain of mimo system is to rely on the scattering of signal to obtain to a great extent, so tend to variation in the performance of the bigger channel mimo system of coefficient correlation.
Traditional SVD scheme is very sensitive to correlation between channels, can become very poor in the performance of the bigger channel SVD scheme of correlation, even can't use.
2, to the limited amount system of antenna
The VBLAST scheme that the SVD scheme combines tradition to use all requires the number of transmit antennas (Nt) can not be greater than reception antenna number (Nr).The antenna number at base station place is often greater than the antenna number of portable terminal (like mobile phone), so the SVD scheme is to the practical application that has influenced MIMO to a certain extent that is limited in of antenna amount in practical application.
Is the Nr < deficiency that can't be suitable under the situation of Nt in order to solve the SVD scheme less than number of transmit antennas at the reception antenna number; When the receiving end signal that carries out the VBLAST system detects; Prior art is for to carry out Space Time Coding to all transmitting antennas, and receiving MIMO with 42 is example, and system is as shown in Figure 3
With reference to shown in Figure 3, receive the VBLAST system for utilizing 42 of Space Time Coding.This system comprises transmitting terminal and receiving terminal, and transmitting terminal comprises: information source module 301, modulation module 302, precoding module 303, string and modular converter 304, Space Time Coding module 314,305,4 transmitting antennas 306 of VBLAST module; Receiving terminal comprises: 2 reception antennas 307, linear combiner module 308, channel estimation module 309, decoder module 310 when empty, and judging module 311, demodulation module 312.This system utilizes 314 pairs of signals of Space Time Coding module to carry out Space Time Coding at transmitting terminal, correspondingly decodes when 310 pairs of signals of decoder module carry out sky during through sky at receiving terminal 31.
The original purposes of Space Time Coding is the performance boost that multi-form (as launching the different linear combinations of its negative value, conjugate or a plurality of signals) through the identical data of transmitting terminal repeat its transmission reaches receiving terminal, utilizes empty time-code to also have the effect of virtual increase receiving terminal number of antennas here.
The mimo systems of for example receiving for 42, if need not empty time-code, receiving terminal will be 4 yuan of equation group (not regarding noise as unknown number) of having only 2 equations, can not find the solution.Use transmitting terminal behind the empty time-code to launch multi-form 4 times of identical data repeatedly, the equation number of the equation group of receiving terminal becomes 8, can find the solution.
But also there is following problem in above-mentioned utilization to the method that all transmitting antennas carry out Space Time Coding:
At first, similar with traditional SVD scheme, this technical scheme is poor performance under the channel condition of high correlation.
Secondly, the capacity of this scheme is lower.
Like the Space Time Coding of 4 transmitting antennas, 4 transmitting antennas have sent 4 different data at 4 time slots, and code check (the on average different pieces of information number of each time slot transmission) is 1, and this is equivalent to the transmission rate of SISO system, and power system capacity descends greatly.
It is thus clear that, utilize SVD to decompose signal is handled poor performance in the bigger channel of correlation, even can't use, can not adapt to the different antennas number again simultaneously; Though and utilize Space Time Coding can adapt to the different antennas number, same under the channel condition of high correlation poor performance, and power system capacity is lower.
Summary of the invention
The technical problem that the present invention will solve provides a kind of adaptive MIMO systems, and system is optimized, and makes it to adapt to the performance of high correlation channel.
In order to solve the problems of the technologies described above; The invention provides a kind of adaptive MIMO systems, comprise transmitting terminal, receiving terminal, and the feedback path from said receiving terminal to said transmitting terminal; Said transmitting terminal comprises antenna; Said receiving terminal comprises signal detection module, and said receiving terminal also comprises unified channel decomposing module, and said unified channel decomposing module is decomposed channel matrix; Decomposite pre-coding matrix and feed back to said transmitting terminal, decomposite weighting coefficient matrix and send to said signal detection module through said feedback path.
Further, said antenna is divided into many groups; Said system also comprises the Space Time Coding module, and said Space Time Coding module is connected with the antenna that divides into groups respectively, and signal packets is carried out Space Time Coding.
Further, two on said antenna is divided into one group.
Further, said signal detection module is the SIC-MMSE detection module.
Another technical problem to be solved by this invention provides a kind of adaptive MIMO systems, makes it to adapt to distinct transmit, reception antenna number.
In order to solve the problems of the technologies described above; The invention provides a kind of adaptive MIMO systems; Comprise transmitting terminal, receiving terminal, said transmitting terminal comprises antenna, and said antenna is divided into many groups; Comprise also and the corresponding Space Time Coding module of antenna sets number that said antenna sets is connected with the Space Time Coding module respectively.
Further, said receiving terminal comprises signal detection module and matrix decomposition module, and said matrix decomposition module is decomposed channel matrix, decomposites pre-coding matrix and feeds back to transmitting terminal, decomposites weighting coefficient matrix and sends to said signal detection module.
Further, said matrix decomposition module is a unified channel decomposing module.
Another technical problem to be solved by this invention provides a kind of adaptive MIMO systems, makes it to adapt to the performance of high correlation channel, simultaneously can adapt to distinct transmit, reception antenna number, and the capacity of elevator system, performance.
In order to solve the problems of the technologies described above, the invention provides a kind of adaptive MIMO systems, comprise transmitting terminal, receiving terminal; And feedback path from said receiving terminal to said transmitting terminal; Said transmitting terminal comprises antenna, and said receiving terminal comprises signal detection module and matrix decomposition module, said antenna grouping; Comprise also and the corresponding Space Time Coding module of antenna sets number that said antenna sets is connected with the Space Time Coding module respectively; Said matrix decomposition module is decomposed channel matrix, decomposites pre-coding matrix and feeds back to transmitting terminal, decomposites weighting coefficient matrix to said signal detection module.
Further, said matrix decomposition module is a unified channel decomposing module.
Another technical problem to be solved by this invention provides a kind of receiving terminal, makes it to adapt to the performance of high correlation channel, and the capacity of elevator system, performance.
In order to solve the problems of the technologies described above; The invention provides a kind of receiving terminal, be used for the signal of mimo system transmitting terminal is received, comprise signal detection module; Also comprise unified channel decomposing module; Said unified channel decomposing module is decomposed channel matrix, decomposites pre-coding matrix and feeds back to transmitting terminal, decomposites weighting coefficient matrix and sends to said signal detection module.
Further, said signal detection module is the SIC-MMSE detection module.
Another technical problem to be solved by this invention provides a kind of transmitting terminal, makes it to adapt to distinct transmit, reception antenna number.
In order to solve the problems of the technologies described above; The invention provides a kind of transmitting terminal, be used for the signal of mimo system is sent, comprise antenna and Space Time Coding module; Said antenna is divided into many groups; Said Space Time Coding module number is corresponding with the antenna sets number, and said Space Time Coding module is connected with antenna sets respectively, and signal is carried out Space Time Coding after the antenna that divides into groups sends.
Further, two on said antenna is divided into one group.
Another technical problem to be solved by this invention provides a kind of signal processing method of adaptive MIMO systems, makes it to adapt to the performance of high correlation channel, simultaneously can adapt to distinct transmit, reception antenna number, and the capacity of elevator system, performance.
In order to solve the problems of the technologies described above, the invention provides a kind of signal processing method of adaptive MIMO systems, be used for transmitting terminal is handled to the signal of receiving terminal, it is characterized in that, may further comprise the steps:
(1) antenna with transmitting terminal divides into groups;
(2) transmitting terminal produces signal, and said signal packets is carried out Space Time Coding;
(3) signal behind the Space Time Coding sends through the antenna that divides into groups;
(4) receiving terminal receives the signal of said grouping, carries out feeding back to transmitting terminal after the matrix decomposition.
Further, said receiving terminal comprises channel estimation module, signal detection module and matrix decomposition module, and said channel estimation module is connected with the matrix decomposition module; In step (4); Channel estimation module is handled after receiving the signal of said grouping, obtains channel parameter and sends to said matrix decomposition module, and said matrix decomposition module is carried out matrix decomposition to channel matrix; Decomposite pre-coding matrix and feed back to transmitting terminal, decomposite weighting coefficient matrix and send to said signal detection module.
Further, the matrix decomposition module is a unified channel decomposing module described in the step (4).
The present invention has used UCD to decompose feedback scheme, and this scheme can make system's (like high correlation channel) under different channel circumstances guaranteeing under the maximum situation of power system capacity the significantly bit error rate performance of elevator system, still can operate as normal.In addition; Be less than at the reception antenna number and combine Space Time Coding, antenna grouping and UCD to decompose feedback technique under the situation of number of transmit antennas; Not only make system can adapt to such antenna number, carry out operate as normal, and existing scheme has promoted power system capacity and bit error rate performance.
Description of drawings
Fig. 1 is 22 receipts mimo system sketch mapes that decompose based on SVD;
Fig. 2 is the pseudo channel model of SVD scheme;
Fig. 3 utilizes 42 of Space Time Coding to receive the VBLAST system;
Fig. 4 the present invention is based on 2 the 2 receipts adaptive MIMO systems sketch mapes that UCD decomposes;
Fig. 5 realizes that for the present invention utilizes Space Time Coding and transmitting terminal antenna grouping 42 are received the mimo system sketch map;
Fig. 6 carries out the sketch map of Space Time Coding simultaneously to 2 transmitting antennas for the present invention;
Fig. 7 the present invention is based on 4 the 2 receipts adaptive MIMO systems sketch mapes that UCD decomposes.
Embodiment
From the angle of SVD scheme, the high correlation of channel has caused the reduction of channel singular value, has also just caused the reduction of virtual subnet channel signal gain.The overall gain of each subchannel is certain under the certain situation of channel parameter; So for different MIMO schemes; The rising of channel relevancy can be thought the decline of channel gain, and for the MIMO framework with a plurality of subchannels, the bit error rate performance of system is determined by the poorest subchannel; So, just can improve systematic function to greatest extent guaranteeing to optimize under the prerequisite of power system capacity difference channel (just make each subchannel gains identical).
The present invention is through adopting " unified channel decomposing " (Uniform ChannelDecomposition of a kind of being called; UCD) scheme is carried out the precoding of transmitting terminal and the input of receiving terminal, guarantees under MMSE (making error mean square value and minimum) detection criteria, to make the gain of each virtual subnet channel identical when power system capacity is maximum.
The present invention also divides into groups through the antenna to transmitting terminal, and signal packets is carried out Space Time Coding, makes system can adapt to the different antennas number.
In addition, the present invention combines UCD decomposition, Space Time Coding, antenna grouping, and a kind of adaptive MIMO systems framework is provided, and when improving systematic function, can adapt to the requirement of different antennae quantity.
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.
Preferred embodiment one:
With reference to shown in Figure 4, for the present invention is based on 2 the 2 receipts adaptive MIMO systems sketch mapes that UCD decomposes.This system comprises transmitting terminal and receiving terminal and feedback path 413, and transmitting terminal comprises: information source module 401, modulation module 402, precoding module 403, string and modular converter 404, VBLAST module 405, and 2 transmitting antennas 406; Receiving terminal comprises: 2 reception antennas 407, linear combiner 408, channel estimation module 409, MIC-MMSE detection module 410, UCD decomposing module 411, demodulation module 412.
For signal detection module, present embodiment adopts the MIC-MMSE detection module, can also use the signal detection module of other types certainly in the practical application.This is suitable equally for preferred embodiment three.
UCD decomposing module 410 decomposites matrix F and matrix W, and matrix F is a pre-coding matrix, feeds back to the precoding module 403 of transmitting terminal through feedback path 413, participates in the precoding processing of signal; Matrix W is a SIC (continuous interference eliminated; The signal layering that promptly needs is detected; One deck is to eliminate interlayer interference under the substitution as a result after each layer detected)-weighting coefficient matrix of MMSE detections needs; Be sent to SIC-MMSE detection module 409 through UCD decomposing module 410, participate in the detection of signal and handle.
The concrete course of work of UCD decomposing module is said with reference to preferred embodiment three.
As previously mentioned, for the MIMO framework with a plurality of subchannels, the bit error rate performance of system is determined by the poorest subchannel.The UCD scheme has farthest been optimized the poorest subchannel, thereby has optimized systematic function, makes it under the high correlation channel condition, also can use.
Preferred embodiment two:
Be less than at reception antenna under the situation of transmitting antenna, with respect to the lower problem of prior art space time coding scheme code check, we propose the scheme with the transmitting antenna grouping.Receiving MIMO with 42 is example, and the block diagram of this scheme is as shown in Figure 5.
With reference to shown in Figure 5,, the present invention realizes that 42 are received the mimo system sketch map for utilizing Space Time Coding and transmitting terminal antenna grouping.This system's transmitting terminal comprises: information source module 501, modulation module 502, string and modular converter 503, Space Time Coding module 504, transmitting antenna 505; Receiving terminal comprises: reception antenna 506, linear combiner module 507, SIC-MMSE detection module 508, demodulation module 509.Reception antenna 506 is 2 in the present embodiment, and transmitting antenna 505 is 4, and reception antenna 506 is less than the number of transmitting antenna 505, and per 2 of transmitting antenna is divided into one group.Space Time Coding module 504 in the present embodiment is 2, and is corresponding with the group number of antenna.
Present embodiment has only provided to exemplary the number of antenna grouping and the number of Space Time Coding module, and antenna also can adopt other number to divide into groups certainly, and the number of said Space Time Coding module is corresponding with the group number of antenna.This is same being suitable for for preferred embodiment three.
Suppose that one has been divided into the K group, so every group of transmitting antenna sends 2 different pieces of informations at two time slots, with reference to shown in Figure 6,2 transmitting antennas carried out simultaneously the sketch map of Space Time Coding for the present invention.The data of transmitting terminal before the current time Space Time Coding are respectively c
1c
2, through the data that form first and second antenna sets behind the Space Time Coding do
C wherein
*The conjugation of expression c, and send first row, secondary series data constantly at t, t+T respectively.Average each time slot of transmitting terminal sends K different pieces of information, and efficient has improved K doubly than existing scheme two.This scheme requires the reception antenna number to be no less than K.
Preferred embodiment three:
In order to make mimo system can adapt to different antennas number, different correlation channel circumstance, we propose a kind of new adaptive MIMO systems.
With reference to shown in Figure 7, for the present invention is based on 4 the 2 receipts adaptive MIMO systems sketch mapes that UCD decomposes.This system comprises transmitting terminal and receiving terminal and feedback path 713.Transmitting terminal comprises: information source module 701, modulation module 702, precoding module 703, string and modular converter 704, Space Time Coding module 705, transmitting antenna 706; Receiving terminal comprises: reception antenna 707, linear combiner 708, channel estimation module 709, SIC-MMSE detection module 710, UCD decomposing module 711, demodulation module 712.
By finding out that the transmitting antenna 706 of present embodiment is 4, is divided into two groups among the figure, every group is 2, and corresponding Space Time Coding module 705 is for also being two.And the reception antenna of receiving terminal 71 is 2.Signal is divided into two groups and is input to two Space Time Coding modules 705 after transmitting terminal is gone here and there and changed through string and modular converter 704, carries out sending respectively through two groups of transmitting antennas 706 behind the Space Time Coding.The sketch map of Space Time Coding such as above-mentioned shown in Figure 6.After receiving terminal receives signal; At first obtain channel parameter by channel estimation module 709; Send to UCD decomposing module 711, decomposite matrix F and matrix W by UCD decomposing module 711 again, matrix F feeds back to the precoding module 703 of transmitting terminal through feedback path 713; Matrix W is sent to SIC-MMSE detection module 710 through UCD decomposing module 711, participates in the detection of signal and handles.
The receiving terminal testing process is following:
Suppose that current channel is piece decline (within a short period of time, channel parameter was constant), channel matrix does
(line number of channel matrix equals the reception antenna number, and columns equals number of transmit antennas), the data of transmitting terminal before current time the 1st, 2 antenna sets Space Time Coding are respectively c
1c
2, s
1s
2
The character r that first reception antenna 707 of receiving terminal receives at continuous two time slots
11, r
12Can be written as:
r
11＝h
11c
1+h
21c
2+g
11s
1+g
21s
2+η
11 (1)
Order
C=(c
1c
2)
T, s=(s
1s
2)
T,
So 1,2 formulas can be written as:
r
1＝H
1c+G
1s+η
1 (3)
Wherein
η
1Be that average is zero additive white Gaussian noise.
In like manner can get the reception signal r at second reception antenna 707 place of receiving terminal
21, r
22(order
) can be written as:
r
2＝H
2c+G
2s+η
2 (5)
Wherein
We define overall acknowledge(ment) signal vector r:
C in 7 formulas, s are the original modulating data before the Space Time Coding, and H is 4 matrixes of 4 row, 4 row, is seen as virtual transmission channel.7 formulas are carried out the SIC-MMSE detection just can obtain initial data.
The present invention uses UCD decomposition feedback that transmission information is carried out precoding.When the reception antenna number is less than number of transmit antennas,, can adapt to the different antennas number through antenna grouping and Space Time Coding are handled sending data.Handle once more sending data in conjunction with UCD decomposition, antenna grouping and Space Time Coding, when improving systematic function, can adapt to the different antennas number.
Certainly, the preferred embodiments of the present invention are not the qualifications to technical scheme of the present invention, are equal to replacement to what technical characterictic of the present invention was done, or corresponding the improvement, still belong within protection scope of the present invention.
Claims (4)
1. an adaptive MIMO systems comprises transmitting terminal, receiving terminal, and the feedback path from said receiving terminal to said transmitting terminal; Said transmitting terminal comprises antenna, and said receiving terminal comprises signal detection module, it is characterized in that; Said signal detection module is the SIC-MMSE detection module; Said receiving terminal also comprises unified channel decomposing module, and said unified channel decomposing module is decomposed channel matrix, decomposites pre-coding matrix and feeds back to said transmitting terminal through said feedback path; The weighting coefficient matrix that decompositing the SIC-MMSE detection needs sends to said SIC-MMSE detection module, and said antenna is divided into many groups; Said system also comprises the Space Time Coding module, and said Space Time Coding module is connected with the antenna that divides into groups respectively, and signal packets is carried out Space Time Coding.
2. adaptive MIMO systems as claimed in claim 1 is characterized in that, two on said antenna is divided into one group.
3. the signal processing method of an adaptive MIMO systems is used for transmitting terminal is handled to the signal of receiving terminal, it is characterized in that, may further comprise the steps:
(1) antenna with transmitting terminal divides into groups;
(2) transmitting terminal produces signal, and said signal packets is carried out Space Time Coding;
(3) signal behind the Space Time Coding sends through the antenna that divides into groups;
(4) receiving terminal receives the signal of said grouping; Unified channel decomposing module by receiving terminal is decomposed channel matrix; Decomposite pre-coding matrix and feed back to said transmitting terminal through feedback path, the weighting coefficient matrix that decompositing the SIC-MMSE detection needs sends to the SIC-MMSE detection module of receiving terminal.
4. method as claimed in claim 5; It is characterized in that; Said receiving terminal also comprises channel estimation module, and said channel estimation module is connected with unified channel decomposing module, in step (4); Channel estimation module is handled after receiving the signal of said grouping, obtains channel parameter and sends to said unified channel decomposing module.
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| US8503572B2 (en) * | 2009-02-02 | 2013-08-06 | Qualcomm Incorporated | Antenna virtualization in a wireless communication environment |
| CN101778072B (en) * | 2010-01-25 | 2012-10-17 | 华为技术有限公司 | Multicarrier and multi-antenna signal sending method and transmitter |
| CN102404030B (en) * | 2010-09-14 | 2014-06-18 | 电信科学技术研究院 | Method, device and system for determining target forming weight vector |
| CN101980467B (en) * | 2010-10-28 | 2012-11-21 | 中国科学技术大学 | Retransmitting linear precoding processing method for multi-input multi-output system |
| CN105337692B (en) * | 2014-08-14 | 2019-09-17 | 电信科学技术研究院 | Down channel method for precoding and device |
| CN105978666B (en) * | 2016-04-22 | 2023-05-30 | 四川大学 | Transmitting terminal and processing method of space-time channel optimization MIMO wireless transmission system |
| CN107733455B (en) * | 2017-09-30 | 2023-04-07 | 天津大学 | Deformation detector based on flexible substrate radio frequency transmitting/receiving module |
| CN107733514B (en) * | 2017-11-23 | 2023-10-27 | 四川大学 | Combined input signal MIMO wireless communication receiving terminal and signal detection method thereof |
| US10749579B1 (en) * | 2019-07-31 | 2020-08-18 | Huawei Technologies Co., Ltd. | Method and system for improving the spectral efficiency of line-of-sight (LoS) multiple-input multiple-output (MIMO) communication systems |
| CN111988247B (en) * | 2019-11-28 | 2022-10-04 | 郑州轻工业大学 | Multi-address access method and system based on signal virtual decomposition |
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| CN1614906A (en) * | 2003-11-05 | 2005-05-11 | 索尼株式会社 | Wireless communications system, wireless communications apparatus and wireless communications method |
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